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Preparation and hydrophobic modification of ethanol perm-selective Silicalite-2 zeolite membrane

Authors： GONG liang1,2, ZHAO ming1, CHAI lijun1, SONG wensen1, YANG jianhua1

Units： 1. Xi’an Polytechnic University, State owned Assets Management Division, Xi'an 710048, China

KeyWords： Silicalite-2 membrane; Pervaporation; Ethanol/Water; Hydrophobic Modification

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(1):24-32

Abstract：

Silicalite-2 zeolite membrane has strong hydrophobicity due to the special straight channels and the absence of Al element in the framework, so it can be used as a potential excellent zeolite membrane material. A secondary hydrothermal growth method was used on a macroporous alumina support to prepare the Silicalite-2 zeolite membrane by crystallization at 150℃ for 72 hours. The separation performance of Silicalite-2 zeolite membrane was studied for 5 wt.% of ethanol/water mixture at 60°C, exhibiting a flux and separation factor of 7.61 kg·m-2·h-1 and 6.7, respectively. The hydrophobic modification of membrane materials is an effective way to improve the separation performance of ethanol/water mixtures. In this paper, a layer of silica particles is loaded on the surface of the zeolite membrane, and further modified with trimethylchlorosilane to enhance its hydrophobicity. The hydrophobicity of the modified zeolite membrane is significantly improved with a water contact angle of 127.5°. Moreover, the modified membrane shows a flux and separation factor of 3.67 kg·m-2·h-1and 31.4, respectively for 5 wt.% of ethanol/water mixture at 60℃.

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AuthorIntro：

龚亮，高校老师，高分子材料膜科学专业

Reference：

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